Security challenges face Boston for attack anniversary marathon

As Boston prepares to hold its first marathon since the attack on last year's event, in which three people were killed and over 260 wounded, the US city faces numerous security challenges. Duration: 02:32

http://www.wltx.com/video/3483337136001/1/Security-challenges-face-Boston-for-attack-anniversary-marathonhttp://cdn.newslook.com/d1/d132bd598ee222f267d263b944c7a4b7/images/frame_ext.jpgSecurity challenges face Boston for attack anniversary marathonAs Boston prepares to hold its first marathon since the attack on last year's event, in which three people were killed and over 260 wounded, the US city faces numerous security challenges. Duration: 02:32WashingtonamericaJoe BidenBarack Obamadeval patricksportsDzhokhar TsarnaevmassachusettsbostonnewslookUnited States of AmericaWorldKevin Edson02:32